Method of forming wheel-hubs.



1. 3. WINTER. METHOD OF FORMING WHEEL HUBS. APPLICATION FILED AUG-31.I914.

Patented Feb. 26, 1918.

WITNESSES: lA/l/E/V T01? WOZMGL I T7057? 72. 7V6)? 3L6) m W iw w Jenn n.WINTER, or nn'rnorr, mrcnrean, ASSIGNOR 'ro KELSEY WHEEL ooivrrnn'r, onnn'rnorr, MICHIGAN, A conronarronr or MICHIGAN.

mnrnon or FORMING WHEEL-Hons.

masses.

Specification of Letters Patent.

Patented Feb. as, rare.

Application filed August 31, 1914. Serial no. 859,570.

To all whom it may concern:

Be it known that T, Jorm R. WINTER, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and StatewfMichigan, have invented cerhas particular reference to the manner offorming a roll or return-bentconnection between the cylindrical body ofthe hub and the annular flange.

In the present state of the art wheel hubs have been formed from a flatblank by cupping to form the cylindrical body portion,

leaving an annular flange in the original.

plane of the blank for extending at one side of the spokes. When formedin this manner it is impossible to avoid a round fillet between theflange and the cylindrical body, which interferes with the, butting ofthe ends of the spokes against the cylindrical portion. the bearings inthe hub it is desirable to have the cylindrical portion extended outsideof the plane of the flange. Such a re sult can only be accomplished byforming a return-bend intermediate of the cylindrical body and theflange, which structure is diflicult to form by dies. I have thereforedevised a novel method of forming a hub with such a return-bend ashereinafter set forth.

In the drawings:

Figure 1 is a section through a blank after i the cupping operation, forformingthe cy- 'lindrical portlon;

- Fig. 2 shows the manner of initiating the return-bend;

A Fig. 3 illustrates the operation for completing the return-bend;

Fig. 4: shows the bend after completion; Fig. 5 is a complete centralvertical sectional view of the parts positioned as partly shown in Fig.2; and

Fig. 6 is a complete vertical section of the parts positioned as partlyshown in Fig. 4. The sheet metal blank is first fashioned by theusual-cupping operations to form a structure having a cylindricalportion A, the outwardly-extending annular flange 18 at Furthermore, toproperly center the end thereof,'and a flaring portion C intermediatethe portions A and B. The blank is then pressed in dies D and E, whichrefashion the flaring portion C to produce a slight return-bend Fbetween the flange B and cylinder A. This operation may be readilyperformed, as the opening is so slight as not to require any considerable flow of the metal or change in the gage thereof. If, howeveig adeep return-bend is to be formed by die operations, this wouldnecessitate a succession of steps, in each of which the return-bendwould be but slightly increased in depth. T have greatly simplified theprocess by subjecting the blank with the initial return-bend therein tothe action of a hammer which in a single blow completes the formation ofthe structure desired. Thus, asshown in Fig. 3, the portion A of theblank is held in a die G with the flange B and initial return-bend Fspaced from the upper surface H of said die. A drop or -hammer die T,having an annular portion J and recess K, is then caused to operateagainst the flange B, carrying this downward against the surface H, androlling over the metal intermediate of the flange and the cylindricalportion of the blank to form the top return-bend K. During thisoperation the metal which is return-bent is free to flow in its naturalcourse and to distribute itself without restraint. Thus, as shown in 'Fig. 4:, the section is thickened at K and the inside face of the" bendis'not parallel with the outer face thereof.

As has been stated, my improved process cuts out a number of stepsnecessary in die operations, and consequently the cost of manufacture isreduced.

What I claim as my invention is 1. The method of forming flanged wheelhubs, comprising the drawing of a flat blank to form a cylindricalportion with an annular flange at one end, re-fashioning the metalintermediate of said flange and cylindrical portion to initiate areturn-bend, and carry- 1 10o ing said flange backward over' saidcylindrical portion to roll over and deepen said return-bend. 2. Themethod of forming flanged wheel hubs, comprising the drawing of a flatblank to forma cylindrical portion with an annular flange at one endthereof, re-fashioning the metal intermediate of said flange andcylindrical portion to initiate a return-bend, and subjecting saidflange to a hammer blow to carry the same over said cylindrical portionand to roll over and deepen said returnbend. I

3. The method of forming flanged wheel hubs, comprising the drawing of aflat blank to form a cylindrical portion with an annular flange at oneend and a flaring intermediate portion, re-fashioning said flaringintermediate portion to initiate a rounded return-bend, engaging saidcylindrical portion in a fixed relation to a die or anvil with saidflange spaced from said die or anvil, and subjecting said flange to ahammer blow ,for flattening the same against said die or lar flange atone end, and carrying said flange backward over said cylindrical portionand simultaneously rolling the portion of the cylinder adjoining theflange to form a return-bend.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN R. WINTER.

, Witnesses:

PHYLLIS COBURN, JAMES P. BARRY.

